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FILE SHREDDER PRO : SHREDDING ALGORITHMS
Delete Files Permanently - files shredding software |
Shredding algorithms
Using Delete Files Permanently you can choose to shred files using any of built-in shredding algorithms or you can create your own shredding algorithm or create shredding algorithms based on built-in algorithms to be certain that your confidential files, data and information are totally erased.
Built-in list of shredding algorithms:
- Fast (1 pass)
The fastest shredding algorithm. Your data is overwritten with zeroes.
- British HMG IS5 (Baseline) (1 pass)
Your data is overwritten with zeroes with verification.
- Russian GOST P50739-95 (2 passes)
GOST P50739-95 shredding algorithm calls for a single pass of zeroes followed by a single pass of random byte.
- British HMG IS5 (Enhanced) (3 passes)
British HMG IS5 (Enhanced) is a three pass overwriting algorithm: first pass - with zeroes, second pass - with ones and the last pass with random bytes (last pass is verified).
- US Army AR380-19 (3 passes)
AR380-19 is data shredding algorithm specified and published by the U.S. Army. AR380-19 is three pass overwriting algorithm: first pass - with random bytes, second and third passes with certain bytes and with its compliment (with last pass verification) .
- US Department of Defense DoD 5220.22-M (3 passes)
DoD 5220.22-M is three pass overwriting algorithm: first pass - with zeroes, second pass - with ones and the last pass with random bytes. With all passes verification.
- the US Department of Defense DoD 5220.22-M (E) (3 passes)
DoD 5220.22-M (E) is three pass overwriting algorithm: first pass - with certain bytes, second pass - with its complement and the last pass - with random bytes.
- NAVSO P-5239-26 (RLL)
NAVSO P-5239-26 (RLL) is three pass overwriting algorithm with last pass verification.
- NAVSO P-5239-26 (MFM)
NAVSO P-5239-26 (MFM) is three pass overwriting algorithm with last pass verification.
- the US Department of Defense DoD 5220.22-M(ECE) (7 passes)
DoD 5220.22-M(ECE) is seven pass overwriting algorithm: first and second passes - with certain bytes and with its compliment, then two passes with random character, then two passes with character and its complement and the last pass - with random character.
- Canadian RCMP TSSIT OPS-II (7 passes)
RCMP TSSIT OPS-II is seven pass overwriting algorithm with three alternating patterns of zeroes and ones and the last pass - with random character (with last pass verification).
- German VSITR (7 passes)
The German standard calls for each sector to be overwritten with three alternating patterns of zeroes and ones and in the last pass with character.
- Bruce Schneier (7 passes)
The Bruce Schneier shredding algorithm has seven passes: first pass - with ones, the second pass - with zeroes and then five times with random characters.
- Peter Gutmann (35 passes)
Peter Gutmann shredding algorithm has 35 passes.
How to add shredding algorithms
Delete Files Permanently allows you to add new shredding algorithms and view and edit existing ones - you can set number of shredding passes and byte patterns used in every pass.
To add shredding algorithm:
Double-click on Delete Files Permanently desktop icon
Click the Tools button in the toolbar.
Select 'Wiping scheme' item.
Click 'Add' button.
Enter wiping scheme's name
To add new overwrite pass, click 'Add pass' button
In 'Add/modify pass' window:
• select Byte pattern - select what symbol(s) you want to use for data overwriting:
- select 'Certain value' option - to use any symbol you want for data overwriting
- select 'Random' option - if you want to use random bytes for overwriting data on this pass
- select 'Complement' option - to use complement to the previous pass value
• select 'Number of byte patterns' - set how many byte patterns you want to use for the wiping pass. You can use up to 5 byte patterns
Note:
1. You can't use 'Use complement value' for the first pass as there is no previous value
2. For your convenience you can enter byte patterns in different formats:
- in binary format
- in symbol format
- in hexadecimal format
• Verification:
- without verification - overwrite data without verification
- last step - overwrite data and verify last step (pass) only
- verify all steps - Delete Files Permanently overwrites data and verifies each step (pass) if the data was written correctly to disk
Note: If you select 'Last step' or 'All steps' verification, you should select program actions if verification is failed:
- ask about necessary action if verification failed
- skip current pass
- delete file any way
FAQ
• How can I delete Internet Explorer history files?
As you surf the Internet, Internet Explorer stores information about the web sites you visited, information you entered on web sites, etc. It can also seriously compromise your security and privacy, as anyone who has access to your computer can see what web sites you visited and what information you entered on web pages.
To delete files of Internet Explorer history:
• Select "Tools"
• Select "Internet Options".
• Open the "General" tab.
• In "Browsing history" area click the "Delete" button.
• In "Delete browsing history" window click "Delete all", and then click Yes.
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generates really strong passwords